From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Tue, 5 Feb 2002 12:42:14 -0700 From: Val Henson To: Benjamin Herrenschmidt Cc: linuxppc-dev@lists.linuxppc.org Subject: Re: Highmem on PPC? Message-ID: <20020205124214.H6834@boardwalk> References: <20020205115618.D6834@boardwalk> <20020205193316.19866@smtp.wanadoo.fr> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii In-Reply-To: <20020205193316.19866@smtp.wanadoo.fr>; from benh@kernel.crashing.org on Tue, Feb 05, 2002 at 08:33:16PM +0100 Sender: owner-linuxppc-dev@lists.linuxppc.org List-Id: On Tue, Feb 05, 2002 at 08:33:16PM +0100, Benjamin Herrenschmidt wrote: > > >I'm currently getting hard crashes on the dual 7410 with highmem. Not > >even the SMI starts xmon. I'm not sure that it's a software bug, > >which is why I'm getting the dual 7450. > > Interesting. I have similar reports about dual 800s with 1.5G of RAM. > I don't personally have a machine with that much RAM, so it makes things > a bit difficult to debug. All I noticed so far is that > enabling interrupt distribution will cause occasional lockups on my > dual 7400 at work (not related to highmem). So if you plan to chase > this highmem bug, start by disabling that option to avoid mixing > problems. I don't use interrupt distribution. I triggered the absolute hard hang with my usual tests: 5 or 6 of the following running in the background: find /mnt/cdrom -exec cat {} \; > /dev/null 2>&1 & find /usr -exec cat {} \; > /dev/null 2>&1 & And a make -j8 zImage in the foreground. I didn't even start the flood ping before it hung. :) > Just in case it's a spinlock bug (who knows...) you may want to hack > the spinlock debug output to use the btext engine (basically #define > printf to xmon_printf in the spinlock code and hack xmon/start.c to > force use_screen). This is actually over serial console, but I'll keep that in mind when I get the apple. > And let me know if you find something ;) :) You bet. You're sure you're not seeing these hangs? What are you using, dual 7400 with 1 GB RAM? -VAL ** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/